package com.wqi.chapter6;

public class Car {

	public Engine engine = new Engine();
	public Wheel[] wheels = new Wheel[4];
	public Door left = new Door(),
		right = new Door();
	Car(){
		for(int i =0;i<4;i++){
			wheels[i] = new Wheel();
		}
	}
	public static void main(String[] args) {
		Car car = new Car();
		car.left.window.rollup();
		car.wheels[0].inflate(72);
	}

}

class Engine{
	public void start(){};
	public void rev(){};
	public void stop(){};
}

class Wheel{
	public void inflate(int psi){}
}

class Window{
	public void rollup(){}
	public void rolldown(){}
}

class Door{
	public Window window = new Window();
	public void open(){}
	public void close(){}
}
